Filter



FIG. 1 is a perspective view of a filter embodying the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view, the right side being a mirrorimage thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for filter, as shown and described.